A/C - Refrigerant Loss, Loose or Missing Access Fitting
89chevy23GMC NUMBER: 89-T-78
GROUP: 1B - Air Conditioning
DATE: July, 1989
CORPORATE
NUMBER: 971202R
SUBJECT: A/C REFRIGERANT LOSS DUE TO LOOSE OR MISSING ACCESS FITTING CAPS
MODELS: ALL 1988 - 1989 TRUCK MODELS
Figure No. 1:
All GM air conditioning Hi side and Low side access fittings are supplied with a black plastic cap and seal assembly which provides the primary refrigerant seal for the service fittings. If the cap and seal assembly is missing or loose, a significant amount of refrigerant may leak through the valve core located in the access fittings, which could result in poor A/C performance or failure.
When servicig any vehicle's A/C system, make sure alll access fitting cap seals (refer to Figure 1) are in place and tight. Caps should be threaded on until contact with the "O" ring seal is made and then tightened another 1/4 - 1/2 turn to ensure proper sealing.
High Side Low Side
Valve - Cap and Seal Valve - Cap and Seal
P/N 3033974 PIN 6551640
Parts are currently available from GMSPO.